The parking brake lever is connected to the rear wheel brake mechanisms by two cables. When the lever is raised to the upper position, the levers mounted on the rear pads rotate and begin to press on the spacer bars. At the same time, the rear brake pads move apart and prevent the drum from turning.
Parking brake system:
1 - parking brake lever;
2 - lever rod;
3 - right rear wheel brake drive cable;
4 - washer;
5 - adjusting nut;
6 - lock nut;
7 - left rear wheel brake drive cable;
8 - spacer bar;
9 - lever;
10 - cable equalizer;
11 - rubber cover;
12 - thrust axis.
(Material was taken from the website ladaman.ru)